Thanks to all that responded
I successfully upgraded 800GB DB with pg_upgrade in about 2 hours.
This would have taken 2 days to dump/restore.
Slon is also starting to not be viable as it takes some indexes over 7
hours to complete. So this upgrade path seemed to really be nice.
Not sure how I can incorporate with my slon cluster, I guess that will
be the next thing I research.
Appreciate the responses and assistance.
Tory